# CVE-2022-50045: linux: In the Linux kernel, the following vulnerability has been resolved:  powerpc/pci: Fix get_phb_number() locking  The r...

CVE-2022-50045 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50045, released June 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-50045
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 18, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  powerpc/pci: Fix get_phb_number() locking  The recent change to get_phb_number() causes a DEBUG_ATOMIC_SLEEP warning on some systems:    BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580   in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper   preempt_count: 1, expected: 0   RCU nest depth: 0, expected: 0   1 lock held by swapper/1:    #0: c157efb0 (hose_spinlock){+.+.}-{2:2}, at: pcibios_alloc_controller+0x64/0x220   Preemption disabled at:   [<00000000>] 0x0   CPU: 0 PID: 1 Comm: swapper Not tainted 5.19.0-yocto-standard+ #1   Call Trace:   [d101dc90] [c073b264] dump_stack_lvl+0x50/0x8c (unreliable)   [d101dcb0] [c0093b70] __might_resched+0x258/0x2a8   [d101dcd0] [c0d3e634] __mutex_lock+0x6c/0x6ec   [d101dd50] [c0a84174] of_alias_get_id+0x50/0xf4   [d101dd80] [c002ec78] pcibios_alloc_controller+0x1b8/0x220   [d101ddd0] [c140c9dc] pmac_pci_init+0x198/0x784   [d101de50] [c140852c] discover_phbs+0x30/0x4c   [d101de60] [c0007fd4] do_one_initcall+0x94/0x344   [d101ded0] [c1403b40] kernel_init_freeable+0x1a8/0x22c   [d101df10] [c00086e0] kernel_init+0x34/0x160   [d101df30] [c001b334] ret_from_kernel_thread+0x5c/0x64  This is because pcibios_alloc_controller() holds hose_spinlock but of_alias_get_id() takes of_mutex which can sleep.  The hose_spinlock protects the phb_bitmap, and also the hose_list, but it doesn't need to be held while get_phb_number() calls the OF routines, because those are only looking up information in the device tree.  So fix it by having get_phb_number() take the hose_spinlock itself, only where required, and then dropping the lock before returning. pcibios_alloc_controller() then needs to take the lock again before the list_add() but that's safe, the order of the list is not important.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-50045](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50045.md) | Jun 18, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-50045](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50045.md) | Jun 18, 2025 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-50045](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50045.md) | Jun 18, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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